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From "Zuoming Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13673) TestNameNodeMetrics fails on Windows
Date Thu, 14 Jun 2018 16:58:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16512744#comment-16512744
] 

Zuoming Zhang commented on HDFS-13673:
--------------------------------------

So you mean testCorruptBlock is another issue? Just double confirm to make sure it's not caused
by my patch. [~elgoiri]

> TestNameNodeMetrics fails on Windows
> ------------------------------------
>
>                 Key: HDFS-13673
>                 URL: https://issues.apache.org/jira/browse/HDFS-13673
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.1.0, 2.9.1
>            Reporter: Zuoming Zhang
>            Assignee: Zuoming Zhang
>            Priority: Minor
>              Labels: Windows
>             Fix For: 3.1.0, 2.9.1
>
>         Attachments: HDFS-13673.000.patch, HDFS-13673.001.patch, TestNameNodeMetrics-testVolumeFailures-Report.000.txt,
TestNameNodeMetrics-testVolumeFailures-Report.001.txt
>
>
> _TestNameNodeMetrics_ fails on Windows
>  
> Problem:
> This is because in _testVolumeFailures_, it tries to call _DataNodeTestUtils.injectDataDirFailure_ on
a volume folder. What _injectDataDirFailure_does is actually modifying the folder name from _volume_name_ to _volume_name_._origin_ and
create a new file named as _volume_name_. Inside the folder, it has two things: 1. a directory
named as "_current_", 2. a file named as "_in_use.lock_". Windows behaves different from
Linux when renaming the parent folder of a locked file. Windows prevent you from renaming
while Linux allows.
> Fix:
> So in order to inject data failure on to the volume. Instead of renaming the volume folder
itself. Rename the folder inside it which doesn't hold a lock. Since the folder inside the
volume is "_current_". Then we only need to inject data failure to _volume_name/current_.



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